11303回风巷泥质砂岩底板变形机制研究

Study on Deformation Mechanism of Argillaceous Sandstone Floor of11303 Ventilation Roadway

为解决红庆梁煤矿11303回风巷泥质砂岩底板的变形问题,通过现场调研和室内实验研究了该巷道底板水理性质,并结合数值模拟揭示了巷道底板的变形机制。研究结果表明:底板泥质砂岩含黏土矿物,遇水易体积膨胀,底板破坏类型主要为遇水膨胀底鼓;巷道开挖后,垂直位移主要发生在顶底板,以顶底板为边界向两侧扩散,底板扩散宽度较大,顶板扩散深度较大;受帮部高应力影响,底板位移分布与重力方向所成夹角相关。

In order to solve the deformation problem of argillaceous sandstone floor of 11303 ventilation roadway in Hongqingliang coal mine, the hydrologic properties of the roadway floor were studied through field investigation and laboratory experiment, and the deformation mechanism of the roadway floor was revealed by numerical simulation. The results show that the floor argillaceous sandstone contains clay minerals, which is easy to expand in volume when water is encountered;the main failure type of floor is swelling floor heave when water is encountered;after roadway excavation, the vertical displacement mainly occurs in the roof and floor, and diffuses to both sides with the top and floor as the boundary,the width of the floor diffusion is larger, and the depth of the roof diffusion is larger;under the influence of high stress at the side, the distribution of displacement in the roadway floor is related to the included angle formed by the direction of gravity.